KVM: Trace shadow page lifecycle
Create, sync, unsync, zap.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c0dda64..ac121b3 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1122,6 +1122,7 @@
return 1;
}
+ trace_kvm_mmu_sync_page(sp);
if (rmap_write_protect(vcpu->kvm, sp->gfn))
kvm_flush_remote_tlbs(vcpu->kvm);
kvm_unlink_unsync_page(vcpu->kvm, sp);
@@ -1244,8 +1245,6 @@
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant;
}
- pgprintk("%s: looking gfn %lx role %x\n", __func__,
- gfn, role.word);
index = kvm_page_table_hashfn(gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(sp, node, tmp, bucket, hash_link)
@@ -1262,14 +1261,13 @@
set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests);
kvm_mmu_mark_parents_unsync(vcpu, sp);
}
- pgprintk("%s: found\n", __func__);
+ trace_kvm_mmu_get_page(sp, false);
return sp;
}
++vcpu->kvm->stat.mmu_cache_miss;
sp = kvm_mmu_alloc_page(vcpu, parent_pte);
if (!sp)
return sp;
- pgprintk("%s: adding gfn %lx role %x\n", __func__, gfn, role.word);
sp->gfn = gfn;
sp->role = role;
hlist_add_head(&sp->hash_link, bucket);
@@ -1282,6 +1280,7 @@
vcpu->arch.mmu.prefetch_page(vcpu, sp);
else
nonpaging_prefetch_page(vcpu, sp);
+ trace_kvm_mmu_get_page(sp, true);
return sp;
}
@@ -1410,6 +1409,8 @@
static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
{
int ret;
+
+ trace_kvm_mmu_zap_page(sp);
++kvm->stat.mmu_shadow_zapped;
ret = mmu_zap_unsync_children(kvm, sp);
kvm_mmu_page_unlink_children(kvm, sp);
@@ -1656,6 +1657,7 @@
struct kvm_mmu_page *s;
struct hlist_node *node, *n;
+ trace_kvm_mmu_unsync_page(sp);
index = kvm_page_table_hashfn(sp->gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
/* don't unsync if pagetable is shadowed with multiple roles */